Improper Verification of Cryptographic Signature in starkbank-ecdsa

GHSA-92vm-mxjf-jqf3 · CVE-2021-43572 · PYSEC-2021-426

Published Nov 10, 2021 · Modified Oct 25, 2024

Description

The verify function in the Stark Bank Python ECDSA library (starkbank-ecdsa) 2.0.0 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-43572
WEB https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f
WEB https://github.com/pypa/advisory-database/tree/main/vulns/starkbank-ecdsa/PYSEC-2021-426.yaml
PACKAGE https://github.com/starkbank/ecdsa-python
WEB https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1
WEB https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries

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